"I bound the souls of some bandits into objects years ago so the envoys could come collect them. Strangely, they never did, and the shackled souls remain here to this day. We will use them as a test for your newly acquired power, but be forewarned they will show you no mercy if you allow them the upper hand. Please take some time to review the skills I have just given you. When you are ready, speak with me again and we can put these souls to rest."

Intermediate Dialogue (Ang the Ephemeral)

"When you are ready, approach the Soul Keepers and open them. Dispatch the shackled spirits using your new skills."

Walkthrough

Head south from Tsumei Village and follow the quest marker to Ang. Speak with him to get your pre-quest skills. Speak with Ang again to activate the quest once you are ready to do battle with the spirits. Open each chest and destroy the spirit that spawns from it. Once all chests have been opened and all spirits destroyed speak to Ang for your reward.

The spirits are bound to unlocked chests. You can wait for your skills and spells to regenerate before you open them to attack.